Which types of rock are used in radiometric dating Flirt and hook up with sexy girls for free
The universe is full of naturally occurring radioactive elements.
Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms." When molten rock cools, forming what are called igneous rocks, radioactive atoms are trapped inside. By measuring the quantity of unstable atoms left in a rock and comparing it to the quantity of stable daughter atoms in the rock, scientists can estimate the amount of time that has passed since that rock formed.
Each radioactive decay series takes a characteristic length of time known as the radioactive half-life, which is the time taken for half of the original (parent) isotope to decay to the new (daughter) isotope.Radiometric dating uses the decay of isotopes of elements present in minerals as a measure of the age of the rock: to do this, the rate of decay must be known, the proportion of different isotopes present when the mineral formed has to be assumed, and the proportions of different isotopes present today must be measured.This dating method is principally used for determining the age of formation of igneous rocks, including volcanic units that occur within sedimentary strata.It is also possible to use it on authigenic minerals, such as glauconite, in some sedimentary rocks.Radiometric dating of minerals in metamorphic rocks usually indicates the age of the metamorphism.